<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="flag" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <MyTable
          v-for="(item, index) in goodList"
          :key="index"
          :name="item.name"
          :price="item.price"
          :num="item.num"
          :checked="item.checked"
          :index="index"
          @handleCut="item.num = $event"
          @handleAdd="item.num = $event"
          @handleDel="remove"
          @handleChange="handleChange"
        ></MyTable>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ sum }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import MyTable from "./components/my-table.vue";
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
      // flag: false,
    };
  },
  components: {
    MyTable,
  },
  methods: {
    remove(id) {
      // const index = this.goodList.findIndex((item, index) => index === id);
      this.goodList.splice(id, 1);
    },
    handleChange(index) {
      this.goodList[index].checked = !this.goodList[index].checked;
    },
  },
  computed: {
    sum() {
      return this.goodList
        .filter((item) => item.checked === true)
        .reduce((pre, item) => pre + item.price * item.num, 0);
    },
    flag: {
      get() {
        return (
          this.goodList.filter((item) => item.checked === true).length ===
          this.goodList.length
        );
      },
      set(value) {
        // console.log(value);
        this.goodList.forEach((item) => (item.checked = value));
      },
    },
  },
};
</script>

<style></style>
